How To Attach A Flat Roof To An Existing Roof

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How to attach a flat roof to an existing roof.

Install shed rafters from the ledger board to the outer wall using metal rafter hangers which attach to the ledger board with screws or nails. Fit rafter board into the u shaped hangers and nail it in place. You have to do it thoroughly so that the rafters sit flush on it. Flashing and more roofing compound are used to weatherproof the joint.

Add decking atop the roof and nail on metal flashing where the shed roof joins the existing roof. Otherwise remove the soffit and fascia from the hip roof on that side. Make a cutting on one of the sides of the horizontal roof beam on an angle. Attach ledger boards to the joists at the site of the junction if you are connecting the flat roof below the hip roof fascia.

Attaching below the ridge. In the case of a lean to roof over an addition the existing rafters will have to be cut away to accommodate the addition and the shed roof will require support where. Attach the horizontal beam by using a nail gun. After that to make it flush with the roof of the existing house cut the two outer rafters.

Drip edge or edge metal is a piece of metal that extends approximately 0 75 inch beyond the roof s edge to channel runoff into your gutters. The roof needs to be tied in by lifting up some of the original tiles on the existing roof and then allowing the flat roof to run slightly underneath. It is the process where roofers install a new roof over your existing one i e. Add a new layer of shingles which means that there is no tearing off of the old roof.

Difference between reroofing and roof replacement. Tie the addition s joist headers to the existing walls top plates leaving a trough to run the gutter through later.